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GMS-6440 Medical Physiology Exam 1 Practice Questions and Answers 100% Pass
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GMS-6440 Medical Physiology Exam 1 Practice Questions and Answers 100% Pass What chemical component of the plasma membrane prevents ions from readily and freely moving across the membrane? - ANSWER-Lipids (phospholipids) Where is the concentration of [K+] greater? - ANSWER-In the cytoplasm Acr...

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  • November 19, 2024
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GMS-6440 Medical Physiology Exam 1 Practice
Questions and Answers 100% Pass


What chemical component of the plasma membrane prevents ions from readily and

freely moving across the membrane? - ANSWER✔✔-Lipids (phospholipids)


Where is the concentration of [K+] greater? - ANSWER✔✔-In the cytoplasm


Across a cell's plasma membrane, movemen of water is a ___________ event. -

ANSWER✔✔-Passive through a channel.


Where is the concentration of [Na+] greater? - ANSWER✔✔-In the extracellular fluid.


For a neutrally charged molecule, "Active" transport means the molecules move across a

membrane from? - ANSWER✔✔-A low concentration to a higher concentration.


What molecule is the source of energy for primary active transport to occur? -

ANSWER✔✔-ATP (adenosine triphosphate)


True of False: There is only one type of channel in cell membranes. - ANSWER✔✔-

False.


True or False: Regarding primary active transport, solutes move from a compartment of

low concentration to a compartment of high concentration. - ANSWER✔✔-True.

Always low to high.


Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 1/41

,True or False: Regarding secondary active transport of glucose, the movement of

glucose is from a compartment of high concentration to a compartment of low

concentration. - ANSWER✔✔-False.


True or False: All transport through membrane channels is classified "Active" transport.

- ANSWER✔✔-False.


True or False: Electrolytes are pumped and leaked across cell membranes

simultaneously but independently. - ANSWER✔✔-True.


At what point in time does the electrochemical equilibrium potential exist? -

ANSWER✔✔-At equilibrium.


What major factor that regulates an electrolyte's electrochemical equilibrium potential

across a cell membrane? - ANSWER✔✔-Concentration (chemical) gradient.


True or False: The electrochemical equilibrium potential for a single highly permant ion

species is controlled by the concentration gradient. - ANSWER✔✔-True.


True or False: Movement of a charge electrolyte is determined by the major forces of

voltage plus chemical concentration gradients. - ANSWER✔✔-True.


True or False: The cellular K+ Electrochemical Equilibrium Potential is regulated by

concentration differences across the plasma membranes. - ANSWER✔✔-True.


Which of these ion choices is primarily responsible for establishing a typical cell

membrane's resting potential?

Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 2/41

,A. Mg++


B. Na+


C. K+ - ANSWER✔✔-K+


True or False: Excessive extracellular acid (i.e. [H+]) will raise the concentration of

extracellular potassium ion concentration. - ANSWER✔✔-True.


True or False: Cell Membrane Potential is controlled by the relative degree of ion

permeability as well as ion concentration gradients existing across a cell's plasma

membrane. - ANSWER✔✔-True.


True or False: Rhabdomyolysis can lead to cardiac muscle cell pathology as the result of

creating a condition of hyperkalemia (excessive K+ concentration in the plasma). -

ANSWER✔✔-True.


True or False: A normal lean person consists of 90% water. - ANSWER✔✔-False, 60%

water.


True or False: Most of the sodium in the body is inside the cells. - ANSWER✔✔-False, it

is extracellular. K+ is intracellular.


True or False: The capillary is the main barrier between the intracellular and

extracellular fluids. - ANSWER✔✔-False. The cell wall, also called the plasma

membrane, separates ICF and ECF. The capillary separates the interstitium and the

plasma which are both subcompartments of the ECF.


Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 3/41

, True or False: To measure the volume of the entire extracellular fluid compartment, we

use a substance that moves freely across the capillary but cannot enter the cell. -

ANSWER✔✔-True. An example is insulin.


True or False: Water and small solutes move across the capillary wall by active

transport. - ANSWER✔✔-False. All movement across the capillary wall is PASSIVE.

Driven only by hydrostatic and colloid osmotic (oncotic) pressures.


True or False: The osmolality of the body fluids is greater when all the solutes are large.

- ANSWER✔✔-False. The total number of particles, irrespective of size, determines the

osmolality.


True or False: All water movement in and out of cell is passive. - ANSWER✔✔-True. All

water movement is driven by solute (osmotic) gradients across the cell wall.


True or False: Sodium (Na) is effectively impermeable at the cell wall. - ANSWER✔✔-

True. Any Na that does enter the cell will be immediately removed by the Sodium

Potassium ATPase in the cell wall.


True or False: Eating a meal high in salt, without drinking any water, will lead to an

increase in both intracellular and extracellular fluid volume. - ANSWER✔✔-False. This

is HYPERTONIC expansion. Ingested NaCl stays extracellular, increases the ECF

osmolality, H2O moves OUT fo cells to restore osmotic equilibrium. Decrease in ICFV,

increase in ECFV.




Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 4/41

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